Electrically-heated sad-iron.



F. KUHN.

BLBGTRIGALLY HEATBD SAD IRON.

: bottom section.

l fioned to extendV over' the wand the nis a 'UNITED sTA'TEs PATENT .fr)1a-FICE.

FRANK KUHN, OE DETROIT, IIICHIGAN,'AssIGNOE To AMERICAN IaLECTItICAL HEATER. COMPANY, OE DETROIT, MICHIGAN, A CORPORATION OE MICHIGAN.-

ELECTBICALLY-HEATED SAD-IRON.

To all whom t may concern:

i Be it known that I, FRANK KUHN, a citi` zen ofthe United States of America, residing at Detroit), in the county of Wayne and.

5 State of Michigan, have invented certain new and useful Improvements in Electrically-Heated Sad-Irons, of which the fol-l lowing is a specification, reference being had therein to thea ompanying drawin s.

0 The invention relates to electrically cated sad-irons and consists -in varlous features of4 construction as hereinafterA set forth.

In the d1'awings,- -F igure 1 is a .vertical central longitudinal, section; Figs 2 is a per- '5` spective view of the guide and holder; for'the attachment plug; and Fi .-3 is a `perspeetive view of the heat distri ting plate; Fig. 4' 'isaerspective view of the4 heating element; Fig. 5 is a perspective view of the a My improvements are `applicable to sad- I irons of that type in which'the heatin 'element is removably securedto the bo y of 'the iron. The-objectofsuch construction is :5 to permtgreplacement 'of the unit when necessary,'and itis desirable that this operation should require :as little mechanical skill as possible so that it may .be performed by the ordinary user of the iron.' I have therefore, i0 devised a construction of unit rovided wlth ametal caseor sheathin whic will protect theresistance elementu'rom injury without interferencewith the rapid dissi tion of -heat therefrom. This heatin unit is :fashy of the iron 'parallel to the work face and is.' clam d thereto by a superposed `heat distributing i Amember, the result being that 1the heat-is uni'forr'nl distributed through -both the body l istributin member.

The particular eature of'thei'nven'tion is the peculiar arrangement andv combination ofthe unit, the work body andthe ,superposed heat distributing member. These l5 Aare s0 r'oportioned that the heating element at thin structure arran ed between.

` plates of considerably greater t ckness, re-

spectively forming the work body and heat Fi1rthern 1ore,v the i0 work body and heat distributing member distributing member.

Patented May 1 9, 1914-.l

l 'are substantially the same in thickness and in mass', while their interior faces are machined toaocurately Contact withthe sheathl ing of the heating element. Such an ar- 55 rangement has several advantages.' First, the equal thickness and substantially equal mass of the bodies above and below the element will prevent the warping of the-iron which frequently occurs where the elementis clamped .between plates of unequal thickness; second, the heat generated in the resistance element will pass rapidlythrough the thm' walls of the sheathing and is distributed with uniformity over the entire v I work surface of the iron.

construction of the hood and handle combined therewith, and further, Athe means employed for terminal plug. v, y

In detail A isthe bot-tom section or guiding and supporting the q of the iron preferably formed Off'case metal and having parallel bottom and'top faces, B y

is the heating` element' arranged above the Y plate A land of substantially the same area as the-upper face thereof. The internal cpn-" strictlon of thls heatlng element forms no part of the present invention buty .the arl rangement'-is such that the resistance i inclosed in a'thin flat metallic sheathing hav- .ing'in'sulated terminals C, Cf .mechanically `secured to and extending outward therefrom. `The elcl'nent is-also preferably c ut away -in the center to prevent overheating at this point, and -also to rovi'de space 'for the passage of the clamping screws.

AD-s theheat distributing late'which is of the same formas the mem ture Y threaded apertures inthe plate A. thesevscrews E has an upward extension Ez which.is Vused for secullnoI in position the4 hood G. This bood is preferably formed f a single sheet metal blank bent into, the de' sired shape, the lower edge resting upon' point bearings H around the marginof the- 65 Another feature of the invention is the member A, the amount" of contacting surface being ver limited so as to reduce to th'e minimum t 1e heat conduction. The handle I .is secured to the hood preferably by a pair of bent bars J which at their lower ends pass through lapertures in the hood and are bentto form'hook portions J which are electrically welded, riveted or otherwise secured to the hood. Thus the hood and the handle constitute a very light structure and allJ the necessary weight of the iron may. be concentrated in the members A and D.

'lhe terminals C, C extend upward from the member Dand are provided with termi- 'nal contact' posts K and K which pass 4outward through apertures inlthe hood in rear of the handle,while insulator bushings. L and L prevent contact of the posts lwith the hood. The terminal posts K, K are parallel to eachother and are adapted to receive the insulated plug member which 1s` at theend of the 'iex'rble conductor, the arrangement being similar to that heretofore employed in irons of this type. With these previous constructions however, the plug 1s supported solely, by its engagement with the terminal posts and the strain sometimes exerted on the l'conductor has a tendency to bendthe posits or to break the plug which is usually formed of fragile material. lI thereforeprovide av socket member for receiving the plug and mechanically supporting Lit independently of its connection with the terminal posts. As 'shown' this member M is formed of sheetmet'al and is fashioned to 'have a shank portion N extending up to the handle I and secured theretoby the same bolt O whichsecures the handle to the'bars J. From the point of attachment the shank extends downward and rearward and .is provided with a socket portion I in alinement'wvith thev posts IQ and K and adapted to receive the outer end of the ter-,U minal plug. Thus in use, the plug'will be supported by this' member and at the same time all direct heat conducting contact loetween the member M and the hood `Gr .is

avoided.

In use, the heat generated in the unit B passes directly through the body A to the work surface and also upward into the member D which forms a distributer and ballast. Inasmuch as these two members Aand D are the same in thickness, substantially the same in mass and of the same material, the expansion and war ing` effected in the one is-counteracted by t 1e 'opposite tendency in the other, the result being that the warping of'the bod which would interfere with the trueness c the work sr "we is avoided. The hood G forms an e'ilective heat-guard and the member M guides and supports the terlninal plug. j-y l Whenever 1t is necessary fe rene".l the element all that is required is to disengage'ithe screws` E and E', remove the hood and the member D and replace the element B, after which the parts may be re-assembled. A

What I claim as my invention is:

1.I In lan .electrically heated sad-iron, the combination with the work body and heating element, ofoa hood `formed of `sheet metal, handle shanks extending throughapertures in said hood and provided with hookportions within the hood, and ,a handie secured between said handle Shanks. y

2. In an electrically heated sad-iron the combination with the work body and heating element, of a hood formed of sheet metal, separate handle Shanks passing through apertures in said hood and hooked beneath the same, means for securing said hook portions to the hood, and a handle secured bev tween said shanks. .I

3. In an electrically heated instrument,

the combination with the work body, a heating element secured thereto, and-terminals projecting outward from said' heating element, of a hood apertured for the passage of said terminals therethrough, a handle for said hood, and a terminal plug support secured to said handle independent of said hood and inalinement with said terminals.

4. In an electrically heated sad-iron, the combination with an apertured hood, electric terminal contacts projecting outward .Atherethrougln a handle secured to said hood,

and a plug support Securedto said -handle independent of said hood and in alinement with said terminals.

5. In an electrically heated sad-iron, the combination with a hood, of a handle, a shank )securing said handle to said hood, a

terminal contact projecting outward fromsaid hood, a plug support separated from said hood and in alinement with said termi- .nal contact, and a shank for said plug support secured to said handle adjacent to said handle shank.

6. In an electrically heated sad-iron, the combination with a work body and termi- Inal contacts projecting outward therefrom,

of a handle and a plug support in alinement with saidy terminal contacts and spaced from the work body, said plug support being secured to .said handle.

7.y An electrically heated sad iron, comprising a work body, a superposed heat dis tributing member, an electric heating unit clamped therebetween` in substantially equal heat conductin r contact therewith, and a hood and han le removably connected to said .work body, the greater portion of the weight 'of -the liron being concentrated in said work body, heating unit, and heat dis-` tributing member. .l

- 8'. In an electricallyheated instrumnt,the combination of a'work body, a superposed hood and in alinement with said outwardlysecured to said hood, a detachable 4electric iributing member and Work body and having terminals permanently secured thereto and` passing outward through aperturesin Said'hood, and a plug support secured to said handle 1n alinement with said terminais.

electrical terminal Contact projecting out- Ward therethrough, a handle secured to said hood having a shank portion substantially -hood and' ir. alinement with parallel to said outWardly-projeeting con-l tact,`and means for supporting a terminal' plug from said handle-independent of'said Y said outwardlyprojecting Contact.

In testimony whereof I affix my signature in presence of two witnesses. Y

i FRANK KUHN.

Vitnesses:

M. J. BELKNAP,

JAMES P. BARRY. 

